RFR: 8281936: compiler/arguments/TestCodeEntryAlignment.java fails on AVX512 machines [v2]

[Vladimir Kozlov]

On Thu, 17 Feb 2022 08:16:38 GMT, Jie Fu <jiefu at openjdk.org> wrote:

>> Hi all, 
>> 
>> compiler/arguments/TestCodeEntryAlignment.java fails on AVX512 machines due to stub size is not big enough.
>> The fix just increasing the stub size for AVX512 platforms.
>> 
>> Testing:
>>   - tier1~3 on Linux/x64 with AVX512, no regression
>> 
>> Thanks.
>> Best regards,
>> Jie
>
> Jie Fu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comment

I would like to hear explanation why the test failed with `-XX:CodeEntryAlignment=16` on avx512 when it passed with bigger default value 32 (or other bigger values): 
https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/x86/globals_x86.hpp#L47

It looks like somewhere we use CodeEntryAlignment to calculate some buffer size. It seems we need to fix that place instead of just bumping this CodeBuffer size.

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PR: https://git.openjdk.java.net/jdk/pull/7485